package com.xiu.concurrency;

import java.util.ArrayList;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

class TaskWithResult implements Callable<String>{
	private int id;
	public TaskWithResult(int id) {
		this.id=id;
	}
	
	@Override
	public String call() throws Exception {
		return "Result of TaskWithResult "+id;
	}
	
}

public class CallableDemo {

	public static void main(String[] args) {
		ExecutorService exec=Executors.newCachedThreadPool();
		ArrayList<Future<String>> results=new ArrayList<Future<String>>();
		for (int i = 0; i < 10; i++) {
			results.add(exec.submit(new TaskWithResult(i)));
		}
		try {
			for (Future<String> future : results) {
				System.out.println(future.get());
			}
		} catch (InterruptedException | ExecutionException e) {
			e.printStackTrace();
		}finally{
			exec.shutdown();
		}
	}

}
